Phase diagram of magnetic ladders constructed from a composite-spin model

Article

关键词: QUANTUM RENORMALIZATION-GROUPS;    ISOTROPIC HEISENBERG CHAIN;    EXCITATION SPECTRUM;    HALDANE-GAP;    NUMERICAL DIAGONALIZATION;    ANTIFERROMAGNETIC CHAIN;    BIQUADRATIC EXCHANGE;    HOMOLOGOUS SERIES;    CRITICAL-BEHAVIOR;    ARBITRARY SPINS;   

DOI  :  10.1103/PhysRevB.55.291

来源: SCIE

【 摘 要 】

White's density matrix renormalization group method has been applied to an S = 1/2 + 1/2 composite-spin model, which can also be considered as a two-leg ladder model. By appropriate choices of the coupling constants this model allows one not only to study how the gap is opened around the gapless integrable models, but also to interpolate continuously between models with different spin lengths. We have found indications for the existence of several different massive phases.

【 授权许可】

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